21201222211122 has 16 divisors (see below), whose sum is σ = 43548456434112. Its totient is φ = 6876072068400.

The previous prime is 21201222211121. The next prime is 21201222211171. The reversal of 21201222211122 is 22111222210212.

It is not an unprimeable number, because it can be changed into a prime (21201222211121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47750500254 + ... + 47750500697.

It is an arithmetic number, because the mean of its divisors is an integer number (2721778527132).

Almost surely, 2^{21201222211122} is an apocalyptic number.

21201222211122 is an abundant number, since it is smaller than the sum of its proper divisors (22347234222990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21201222211122 is a wasteful number, since it uses less digits than its factorization.

21201222211122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95501000993.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21201222211122 its reverse (22111222210212), we get a palindrome (43312444421334).

The spelling of 21201222211122 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred eleven thousand, one hundred twenty-two".